Fluoride reversibly blocks HVA calcium current in mammalian thalamic neurones

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THE effect of intracellular fluoride ions on voltage-dependent calcium currents was tested during whole-cell voltage-clamp recordings in thalamic neurones acutely dissociated from young adult rats. It is demonstrated that 5–30 mM intracellular fluoride selectively and reversibly suppresses the high voltage-activated, dihydropyridine-sensitive calcium current, without affecting the transient, low voltage-activated calcium current. Intracellular diffusion of a fluoride-free solution restores the blocking effect on the slow inactivating current induced by a transitory fluoride perfusion obtained by filling the patch microelectrode tip with caesium fluoride.

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